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App Inventor 2 多用户预订系统如何设计? - App Inventor 2 中文网 - 清泛...
...用网络微数据库(简单易用)或者其他网络数据库产品(mysql 或 leandb,学习成本较高,但可以存储的数据量大)。
一个人订了,另一个人点按钮提醒他已经被订了,这种方式体验差点。另一种,用定时器定时获取网络数据,如...
【持续更新】App Inventor 2 中文拓展一览 - App Inventor 2 中文网 - 清泛...
...写二进制数据
【数据库】LeanDB 数据库扩展
【数据库】MySQL + php后端数据库
【数据库】MongoDB + php后端数据库
AppInventor,AppInventor2,拓展0
常用Linux命令详解(持续更新) - 更多技术 - 清泛网 - 专注C/C++及内核技术
...profile .cshrc .ssh NRU_CMU_DISK_SIZE_NOTIFY2008 install.log .bash_logout .mysql_history.TMP .tcshrc anaconda-ks.cfg
显示每个文件详细的信息(包括文件类型、权限、大小、所属组、创建时间等)(ls -l 等同于 ll 命令)
[root@KEDACOM ~]# ls -l
total 64
-rw-r--...
使用TokuMX配置Replica Set集群 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...替换了一颗真正的数据库存储引擎,我们现在可以像使用MySQL数据库一样精确的指定TokuMX最大可用内存,它也完整支持的事务处理。当然了,TokuTek引以为傲的数据压缩能力也是一点也没落下。性能详细对比请参见《TokuMX vs. MongoDB...
How do I escape a reserved word in Oracle?
...and apparently requires the correct case—whereas, for anyone interested, MySQL defaults to using backticks (`) except when set to use double quotes for compatibility.
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Best Practices: Salting & peppering passwords?
...e that someone with some security experience supports this method. Would a MySQL AES_ENCRYPT($passwordHash, $serverSideKey) call also be an appropriate way of implementing this?
– foochow
Jun 27 '13 at 19:40
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9个常用iptables配置实例 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...-j ACCEPT
类似的,对于HTTP/HTTPS(80/443)、pop3(110)、rsync(873)、MySQL(3306)等基于tcp连接的服务,也可以参照上述命令配置。
对于基于udp的dns服务,使用以下命令开启端口服务:
iptables -A OUTPUT -p udp -o eth0 --dport 53 -j ACCEPT
iptables -A IN...
Adding a new SQL column with a default value
I am looking for the syntax to add a column to a MySQL database with a default value of 0
10 Answers
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Difference between rake db:migrate db:reset and db:schema:load
...ord/Rakefile
which has these tasks.
namespace :db do
task create: ["db:mysql:build", "db:postgresql:build"]
task drop: ["db:mysql:drop", "db:postgresql:drop"]
end
This may not answer your question but could give you some insight into go ahead and look the source over especially the rake file...
Update multiple columns in SQL
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Works on MySQL.
– João Farias
Dec 16 '16 at 19:44
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